705-5100-F21 datasheet(26/52 Pages) MAGNETROL

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57-645 Eclipse Guided Wave Radar Transmitter - PROFIBUS PA™

4.3.4 Offset Description

The parameter referred to as LEVEL_OFFSET in the

Transducer Block is the desired level reading when liquid

surface is at the end of the probe. The Eclipse transmitter is

shipped from the factory with LEVEL_OFFSET set to 0.

With this configuration, all measurements are referenced

from the bottom of the probe. See Example 1.

Example 1 (LEVEL_OFFSET = 0 as shipped from factory):

Application calls for a 72-inch NPT Coaxial probe in

water with the bottom of the probe 10 inches above the

bottom of the tank. The user wants the 0% point at

24 inches and the 100% point at 60 inches as referenced

from the bottom of the probe.

In those applications in which it is desired to reference all

measurements from the bottom of the vessel, the value of

LEVEL_OFFSET should be changed to the distance

between the bottom of the probe and the bottom of the

vessel as shown in Example 2.

Example 2:

Application calls for a 72-inch NPT coaxial probe in

water with the bottom of the probe 10 inches above the

bottom of the tank. The user wants the 0% point at

24 inches and the 100% point at 60 inches as referenced

from the bottom of the tank.

When the Eclipse transmitter is mounted in a chamber/bridle,

it is usually desirable to configure the unit with the 0%

point at the lower process connection and the 100% point

at the upper process connection. The span is the cen-

ter-to-center dimension. In this case, a negative

LEVEL_OFFSET needs to be entered. In doing so, all

measurements are then referenced at a point up on the

probe as shown in Example 3.

Example 3:

Application calls for a 48-inch cage-coaxial flanged probe

measuring water in a chamber with the bottom of the

probe 6 inches below the lower process connection. The

user wants the 0% point to be 0 inches at the bottom

process connection and the 100% point to be 30 inches

at the top process connection.

10"

60"

100%

LCD Menu

24"

PrbModel

7xA-x

PrbMount

NPT

LvlUnits

Probe Ln

72 in

Lvl Ofst

0.0 in

Dielctrc

10-100

Example 1

10"

60"

100%

24"

PrbModel

7xA-x

PrbMount

NPT

LvlUnits

Probe Ln

72 in

Lvl Ofst

10 in

Dielctrc

10-100

LCD Menu

Example 2

30"

100%

PrbModel

7xR-x

PrbMount

Flange

LvlUnits

Probe Ln

48 in

Lvl Ofst

-6.0 in

Dielctrc

10-100

LCD Menu

Example 3

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